Method for performing sidelink transmission prioritized over the uplink transmission in wireless communication system and a device therefor

ABSTRACT

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for performing sidelink transmission prioritized over the uplink transmission in wireless communication system, the method comprising: generating uplink data and sidelink data to be transmitted in a subframe; determining that uplink transmission is denied in the subframe if sidelink transmission is prioritized over the uplink transmission; and transmitting the sidelink data in the subframe where the uplink transmission is denied, wherein the subframe is one of subframes allowed for denial of the uplink transmission during a validity period.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage application under 35 U.S.C. § 371of International Application No. PCT/KR2017/011630, filed on Oct. 20,2017, which claims the benefit of U.S. Provisional Application No.62/416,174, filed on Nov. 2, 2016, U.S. Provisional Application No.62/416,111, filed on Nov. 1, 2016, U.S. Provisional Application No.62/410,866, filed on Oct. 21, 2016, and U.S. Provisional Application No.62/410,398, filed on Oct. 20, 2016. The disclosures of the priorapplications are incorporated by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a wireless communication system and,more particularly, to a method for performing sidelink transmissionprioritized over the uplink transmission in wireless communicationsystem and a device therefor.

BACKGROUND ART

As an example of a mobile communication system to which the presentinvention is applicable, a 3rd Generation Partnership Project Long TermEvolution (hereinafter, referred to as LTE) communication system isdescribed in brief.

FIG. 1 is a view schematically illustrating a network structure of anE-UMTS as an exemplary radio communication system. An Evolved UniversalMobile Telecommunications System (E-UMTS) is an advanced version of aconventional Universal Mobile Telecommunications System (UMTS) and basicstandardization thereof is currently underway in the 3GPP. E-UMTS may begenerally referred to as a Long Term Evolution (LTE) system. For detailsof the technical specifications of the UMTS and E-UMTS, reference can bemade to Release 7 and Release 8 of “3rd Generation Partnership Project;Technical Specification Group Radio Access Network”.

Referring to FIG. 1, the E-UMTS includes a User Equipment (UE), eNode Bs(eNBs), and an Access Gateway (AG) which is located at an end of thenetwork (E-UTRAN) and connected to an external network. The eNBs maysimultaneously transmit multiple data streams for a broadcast service, amulticast service, and/or a unicast service.

One or more cells may exist per eNB. The cell is set to operate in oneof bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz and provides adownlink (DL) or uplink (UL) transmission service to a plurality of UEsin the bandwidth. Different cells may be set to provide differentbandwidths. The eNB controls data transmission or reception to and froma plurality of UEs. The eNB transmits DL scheduling information of DLdata to a corresponding UE so as to inform the UE of a time/frequencydomain in which the DL data is supposed to be transmitted, coding, adata size, and hybrid automatic repeat and request (HARM)-relatedinformation. In addition, the eNB transmits UL scheduling information ofUL data to a corresponding UE so as to inform the UE of a time/frequencydomain which may be used by the UE, coding, a data size, andHARQ-related information. An interface for transmitting user traffic orcontrol traffic may be used between eNBs. A core network (CN) mayinclude the AG and a network node or the like for user registration ofUEs. The AG manages the mobility of a UE on a tracking area (TA) basis.One TA includes a plurality of cells.

Although wireless communication technology has been developed to LTEbased on wideband code division multiple access (WCDMA), the demands andexpectations of users and service providers are on the rise. Inaddition, considering other radio access technologies under development,new technological evolution is required to secure high competitivenessin the future. Decrease in cost per bit, increase in serviceavailability, flexible use of frequency bands, a simplified structure,an open interface, appropriate power consumption of UEs, and the likeare required.

DISCLOSURE Technical Problem

*7An object of the present invention devised to solve the problem liesin a method and device for performing sidelink transmission prioritizedover the uplink transmission.

The technical problems solved by the present invention are not limitedto the above technical problems and those skilled in the art mayunderstand other technical problems from the following description.

Technical Solution

The object of the present invention can be achieved by providing amethod for User Equipment (UE) operating in a wireless communicationsystem as set forth in the appended claims.

In another aspect of the present invention, provided herein is acommunication apparatus as set forth in the appended claims.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

Advantageous Effects

In this invention, it is proposed of a method of UE applying autonomousdenial of uplink transmission if sidelink transmission prioritized overthe uplink transmission and the uplink transmission overlap in a time.

It will be appreciated by persons skilled in the art that the effectsachieved by the present invention are not limited to what has beenparticularly described hereinabove and other advantages of the presentinvention will be more clearly understood from the following detaileddescription taken in conjunction with the accompanying drawings.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention.

FIG. 1 is a diagram showing a network structure of an Evolved UniversalMobile Telecommunications System (E-UMTS) as an example of a wirelesscommunication system;

FIG. 2A is a block diagram illustrating network structure of an evolveduniversal mobile telecommunication system (E-UMTS), and FIG. 2B is ablock diagram depicting architecture of a typical E-UTRAN and a typicalEPC;

FIG. 3 is a diagram showing a control plane and a user plane of a radiointerface protocol between a UE and an E-UTRAN based on a 3rd generationpartnership project (3GPP) radio access network standard;

FIG. 4 is a view showing an example of a physical channel structure usedin an E-UMTS system;

FIG. 5 is a block diagram of a communication apparatus according to anembodiment of the present invention;

FIG. 6 is a conceptual diagram for sidelink communication;

FIG. 7A is a diagram for protocol stack for the user plane of sidelinkcommunication, FIGS. 7B and 7C are diagrams for protocol stack for thecontrol plane of sidelink communication;

FIG. 8 is a diagram for various transmission modes for Sidelink;

FIG. 9 is a conceptual diagram for Vehicle-to-Everything (V2X)communication;

FIG. 10A is a diagram for V2V operation scenario, FIG. 10B is a diagramfor V2I operation scenario, and FIG. 10C is a diagram for V2P operationscenario;

FIG. 11 is a conceptual diagram for performing sidelink transmissionprioritized over uplink transmission in wireless communication systemaccording to embodiments of the present invention; and

FIG. 12 is an example for performing sidelink transmission prioritizedover uplink transmission in wireless communication system according toembodiments of the present invention.

BEST MODE

Universal mobile telecommunications system (UMTS) is a 3rd Generation(3G) asynchronous mobile communication system operating in wideband codedivision multiple access (WCDMA) based on European systems, globalsystem for mobile communications (GSM) and general packet radio services(GPRS). The long-term evolution (LTE) of UMTS is under discussion by the3rd generation partnership project (3GPP) that standardized UMTS.

The 3GPP LTE is a technology for enabling high-speed packetcommunications. Many schemes have been proposed for the LTE objectiveincluding those that aim to reduce user and provider costs, improveservice quality, and expand and improve coverage and system capacity.The 3G LTE requires reduced cost per bit, increased serviceavailability, flexible use of a frequency band, a simple structure, anopen interface, and adequate power consumption of a terminal as anupper-level requirement.

Hereinafter, structures, operations, and other features of the presentinvention will be readily understood from the embodiments of the presentinvention, examples of which are illustrated in the accompanyingdrawings. Embodiments described later are examples in which technicalfeatures of the present invention are applied to a 3GPP system.

Although the embodiments of the present invention are described using along term evolution (LTE) system and a LTE-advanced (LTE-A) system inthe present specification, they are purely exemplary. Therefore, theembodiments of the present invention are applicable to any othercommunication system corresponding to the above definition. In addition,although the embodiments of the present invention are described based ona frequency division duplex (FDD) scheme in the present specification,the embodiments of the present invention may be easily modified andapplied to a half-duplex FDD (H-FDD) scheme or a time division duplex(TDD) scheme.

FIG. 2A is a block diagram illustrating network structure of an evolveduniversal mobile telecommunication system (E-UMTS). The E-UMTS may bealso referred to as an LTE system. The communication network is widelydeployed to provide a variety of communication services such as voice(VoIP) through IMS and packet data.

As illustrated in FIG. 2A, the E-UMTS network includes an evolved UMTSterrestrial radio access network (E-UTRAN), an Evolved Packet Core (EPC)and one or more user equipment. The E-UTRAN may include one or moreevolved NodeB (eNodeB) 20, and a plurality of user equipment (UE) 10 maybe located in one cell. One or more E-UTRAN mobility management entity(MME)/system architecture evolution (SAE) gateways 30 may be positionedat the end of the network and connected to an external network.

As used herein, “downlink” refers to communication from eNodeB 20 to UE10, and “uplink” refers to communication from the UE to an eNodeB. UE 10refers to communication equipment carried by a user and may be alsoreferred to as a mobile station (MS), a user terminal (UT), a subscriberstation (SS) or a wireless device.

FIG. 2B is a block diagram depicting architecture of a typical E-UTRANand a typical EPC.

As illustrated in FIG. 2B, an eNodeB 20 provides end points of a userplane and a control plane to the UE 10. MME/SAE gateway 30 provides anend point of a session and mobility management function for UE 10. TheeNodeB and MME/SAE gateway may be connected via an S1 interface.

The eNodeB 20 is generally a fixed station that communicates with a UE10, and may also be referred to as a base station (BS) or an accesspoint. One eNodeB 20 may be deployed per cell. An interface fortransmitting user traffic or control traffic may be used between eNodeBs20.

The MME provides various functions including NAS signaling to eNodeBs20, NAS signaling security, AS Security control, Inter CN node signalingfor mobility between 3GPP access networks, Idle mode UE Reachability(including control and execution of paging retransmission), TrackingArea list management (for UE in idle and active mode), PDN GW andServing GW selection, MME selection for handovers with MME change, SGSNselection for handovers to 2G or 3G 3GPP access networks, Roaming,Authentication, Bearer management functions including dedicated bearerestablishment, Support for PWS (which includes ETWS and CMAS) messagetransmission. The SAE gateway host provides assorted functions includingPer-user based packet filtering (by e.g. deep packet inspection), LawfulInterception, UE IP address allocation, Transport level packet markingin the downlink, UL and DL service level charging, gating and rateenforcement, DL rate enforcement based on APN-AMBR. For clarity MME/SAEgateway 30 will be referred to herein simply as a “gateway,” but it isunderstood that this entity includes both an MME and an SAE gateway.

A plurality of nodes may be connected between eNodeB 20 and gateway 30via the S1 interface. The eNodeBs 20 may be connected to each other viaan X2 interface and neighboring eNodeBs may have a meshed networkstructure that has the X2 interface.

As illustrated, eNodeB 20 may perform functions of selection for gateway30, routing toward the gateway during a Radio Resource Control (RRC)activation, scheduling and transmitting of paging messages, schedulingand transmitting of Broadcast Channel (BCCH) information, dynamicallocation of resources to UEs 10 in both uplink and downlink,configuration and provisioning of eNodeB measurements, radio bearercontrol, radio admission control (RAC), and connection mobility controlin LTE_ACTIVE state. In the EPC, and as noted above, gateway 30 mayperform functions of paging origination, LTE-IDLE state management,ciphering of the user plane, System Architecture Evolution (SAE) bearercontrol, and ciphering and integrity protection of Non-Access Stratum(NAS) signaling.

The EPC includes a mobility management entity (MME), a serving-gateway(S-GW), and a packet data network-gateway (PDN-GW). The MME hasinformation about connections and capabilities of UEs, mainly for use inmanaging the mobility of the UEs. The S-GW is a gateway having theE-UTRAN as an end point, and the PDN-GW is a gateway having a packetdata network (PDN) as an end point.

FIG. 3 is a diagram showing a control plane and a user plane of a radiointerface protocol between a UE and an E-UTRAN based on a 3GPP radioaccess network standard. The control plane refers to a path used fortransmitting control messages used for managing a call between the UEand the E-UTRAN. The user plane refers to a path used for transmittingdata generated in an application layer, e.g., voice data or Internetpacket data.

A physical (PHY) layer of a first layer provides an information transferservice to a higher layer using a physical channel. The PHY layer isconnected to a medium access control (MAC) layer located on the higherlayer via a transport channel. Data is transported between the MAC layerand the PHY layer via the transport channel. Data is transported betweena physical layer of a transmitting side and a physical layer of areceiving side via physical channels. The physical channels use time andfrequency as radio resources. In detail, the physical channel ismodulated using an orthogonal frequency division multiple access (OFDMA)scheme in downlink and is modulated using a single carrier frequencydivision multiple access (SC-FDMA) scheme in uplink.

The MAC layer of a second layer provides a service to a radio linkcontrol (RLC) layer of a higher layer via a logical channel. The RLClayer of the second layer supports reliable data transmission. Afunction of the RLC layer may be implemented by a functional block ofthe MAC layer. A packet data convergence protocol (PDCP) layer of thesecond layer performs a header compression function to reduceunnecessary control information for efficient transmission of anInternet protocol (IP) packet such as an IP version 4 (IPv4) packet oran IP version 6 (IPv6) packet in a radio interface having a relativelysmall bandwidth.

A radio resource control (RRC) layer located at the bottom of a thirdlayer is defined only in the control plane. The RRC layer controlslogical channels, transport channels, and physical channels in relationto configuration, re-configuration, and release of radio bearers (RBs).An RB refers to a service that the second layer provides for datatransmission between the UE and the E-UTRAN. To this end, the RRC layerof the UE and the RRC layer of the E-UTRAN exchange RRC messages witheach other.

One cell of the eNB is set to operate in one of bandwidths such as 1.25,2.5, 5, 10, 15, and 20 MHz and provides a downlink or uplinktransmission service to a plurality of UEs in the bandwidth. Differentcells may be set to provide different bandwidths.

Downlink transport channels for transmission of data from the E-UTRAN tothe UE include a broadcast channel (BCH) for transmission of systeminformation, a paging channel (PCH) for transmission of paging messages,and a downlink shared channel (SCH) for transmission of user traffic orcontrol messages. Traffic or control messages of a downlink multicast orbroadcast service may be transmitted through the downlink SCH and mayalso be transmitted through a separate downlink multicast channel (MCH).

Uplink transport channels for transmission of data from the UE to theE-UTRAN include a random access channel (RACH) for transmission ofinitial control messages and an uplink SCH for transmission of usertraffic or control messages. Logical channels that are defined above thetransport channels and mapped to the transport channels include abroadcast control channel (BCCH), a paging control channel (PCCH), acommon control channel (CCCH), a multicast control channel (MCCH), and amulticast traffic channel (MTCH).

FIG. 4 is a view showing an example of a physical channel structure usedin an E-UMTS system. A physical channel includes several subframes on atime axis and several subcarriers on a frequency axis. Here, onesubframe includes a plurality of symbols on the time axis. One subframeincludes a plurality of resource blocks and one resource block includesa plurality of symbols and a plurality of subcarriers. In addition, eachsubframe may use certain subcarriers of certain symbols (e.g., a firstsymbol) of a subframe for a physical downlink control channel (PDCCH),that is, an L1/L2 control channel. In FIG. 4, an L1/L2 controlinformation transmission area (PDCCH) and a data area (PDSCH) are shown.In one embodiment, a radio frame of 10 ms is used and one radio frameincludes 10 subframes. In addition, one subframe includes twoconsecutive slots. The length of one slot may be 0.5 ms. In addition,one subframe includes a plurality of OFDM symbols and a portion (e.g., afirst symbol) of the plurality of OFDM symbols may be used fortransmitting the L1/L2 control information. A transmission time interval(TTI) which is a unit time for transmitting data is 1 ms.

A base station and a UE mostly transmit/receive data via a PDSCH, whichis a physical channel, using a DL-SCH which is a transmission channel,except a certain control signal or certain service data. Informationindicating to which UE (one or a plurality of UEs) PDSCH data istransmitted and how the UE receive and decode PDSCH data is transmittedin a state of being included in the PDCCH.

For example, in one embodiment, a certain PDCCH is CRC-masked with aradio network temporary identity (RNTI) “A” and information about datais transmitted using a radio resource “B” (e.g., a frequency location)and transmission format information “C” (e.g., a transmission blocksize, modulation, coding information or the like) via a certainsubframe. Then, one or more UEs located in a cell monitor the PDCCHusing its RNTI information. And, a specific UE with RNTI “A” reads thePDCCH and then receive the PDSCH indicated by B and C in the PDCCHinformation.

FIG. 5 is a block diagram of a communication apparatus according to anembodiment of the present invention.

The apparatus shown in FIG. 5 can be a user equipment (UE) and/or eNBadapted to perform the above mechanism, but it can be any apparatus forperforming the same operation.

As shown in FIG. 5, the apparatus may comprises a DSP/microprocessor(110) and RF module (transceiver; 135). The DSP/microprocessor (110) iselectrically connected with the transceiver (135) and controls it. Theapparatus may further include power management module (105), battery(155), display (115), keypad (120), SIM card (125), memory device (130),speaker (145) and input device (150), based on its implementation anddesigner's choice.

Specifically, FIG. 5 may represent a UE comprising a receiver (135)configured to receive a request message from a network, and atransmitter (135) configured to transmit the transmission or receptiontiming information to the network. These receiver and the transmittercan constitute the transceiver (135). The UE further comprises aprocessor (110) connected to the transceiver (135: receiver andtransmitter).

Also, FIG. 5 may represent a network apparatus comprising a transmitter(135) configured to transmit a request message to a UE and a receiver(135) configured to receive the transmission or reception timinginformation from the UE. These transmitter and receiver may constitutethe transceiver (135). The network further comprises a processor (110)connected to the transmitter and the receiver. This processor (110) maybe configured to calculate latency based on the transmission orreception timing information.

FIG. 6 is a conceptual diagram for sidelink communication.

Sidelink comprises sidelink discovery, sidelink communication and V2Xsidelink communication between UEs. Sidelink uses uplink resources andphysical channel structure similar to uplink transmissions. However,some changes, noted below, are made to the physical channels. Sidelinktransmission uses the same basic transmission scheme as the ULtransmission scheme. However, sidelink is limited to single clustertransmissions for all the sidelink physical channels. Further, sidelinkuses a 1 symbol gap at the end of each sidelink subframe. For V2Xsidelink communication, PSCCH and PSSCH are transmitted in the samesubframe. The sidelink physical layer processing of transport channelsdiffers from UL transmission in the following steps: for PSDCH andPSCCH, the scrambling is not UE-specific; and modulation of 64 QAM and256 QAM is not supported for sidelink. PSCCH is mapped to the sidelinkcontrol resources. PSCCH indicates resource and other transmissionparameters used by a UE for PSSCH. For PSDCH, PSCCH and PSSCHdemodulation, reference signals similar to uplink demodulation referencesignals are transmitted in the 4-th symbol of the slot in normal CP andin the 3rd symbol of the slot in extended cyclic prefix. The sidelinkdemodulation reference signals sequence length equals the size (numberof sub-carriers) of the assigned resource. For V2X sidelinkcommunication, reference signals are transmitted in 3rd and 6th symbolsof the first slot and 2nd and 5th symbols of the second slot in normalCP. For PSDCH and PSCCH, reference signals are created based on a fixedbase sequence, cyclic shift and orthogonal cover code. For V2X sidelinkcommunication, cyclic shift for PSCCH is randomly selected in eachtransmission.

Sidelink communication is a mode of communication whereby UEs cancommunicate with each other directly over the PC5 interface. Thiscommunication mode is supported when the UE is served by E-UTRAN andwhen the UE is outside of E-UTRA coverage. Only those UEs authorised tobe used for public safety operation can perform sidelink communication.

In order to perform synchronization for out of coverage operation UE(s)may act as a synchronization source by transmitting SBCCH and asynchronization signal. SBCCH carries the most essential systeminformation needed to receive other sidelink channels and signals. SBCCHalong with a synchronization signal is transmitted with a fixedperiodicity of 40 ms. When the UE is in network coverage, the contentsof SBCCH are derived from the parameters signaled by the eNB. When theUE is out of coverage, if the UE selects another UE as a synchronizationreference, then the content of SBCCH is derived from the received SBCCH;otherwise UE uses pre-configured parameters. SIB18 provides the resourceinformation for synchronization signal and SBCCH transmission. There aretwo pre-configured subframes every 40 ms for out of coverage operation.UE receives synchronisation signal and SBCCH in one subframe andtransmit synchronisation signal and SBCCH on another subframe if UEbecomes synchronization source based on defined criterion.

The UE performs sidelink communication on subframes defined over theduration of Sidelink Control period. The Sidelink Control period is theperiod over which resources allocated in a cell for sidelink controlinformation and sidelink data transmissions occur. Within the SidelinkControl period the UE sends sidelink control information followed bysidelink data. Sidelink control information indicates a Layer 1 ID andcharacteristics of the transmissions (e.g. MCS, location of theresource(s) over the duration of Sidelink Control period, timingalignment).

The UE performs transmission and reception over Uu and PC5 with thefollowing decreasing priority order in case Sidelink Discovery Gap isnot configured:

i) Uu transmission/reception (highest priority);

ii) PC5 sidelink communication transmission/reception;

iii) PC5 sidelink discovery announcement/monitoring (lowest priority).

The UE performs transmission and reception over Uu and PC5 with thefollowing decreasing priority order in case Sidelink Discovery Gap isconfigured:

i) Uu transmission/reception for RACH;

ii) PC5 sidelink discovery announcement during a Sidelink Discovery Gapfor transmission;

iii) Non-RACH Uu transmission;

iv) PC5 sidelink discovery monitoring during a Sidelink Discovery Gapfor reception;

v) Non-RACH Uu reception;

vi) PC5 sidelink communication transmission/reception.

FIG. 7A is a diagram for protocol stack for the user plane of sidelinkcommunication, FIGS. 7B and 7C are diagrams for protocol stack for thecontrol plane of sidelink communication;

FIG. 7A shows the protocol stack for the user plane, where PDCP, RLC andMAC sublayers (terminate at the other UE) perform the functions listedfor the user plane. The Access Stratum protocol stack in the PC5interface consists of PDCP, RLC, MAC and PHY as shown below in FIG. 7A.

User plane details of sidelink communication: i) there is no HARQfeedback for sidelink communication; ii) RLC UM is used for sidelinkcommunication; iii) a receiving UE needs to maintain at least one RLC UMentity per transmitting peer UE; iv) a receiving RLC UM entity used forsidelink communication does not need to be configured prior to receptionof the first RLC UMD PDU; v) a ROHC Unidirectional Mode is used forheader compression in PDCP for sidelink communication.

A UE may establish multiple logical channels. LCID included within theMAC subheader uniquely identifies a logical channel within the scope ofone Source Layer-2 ID and Destination Layer-2 ID combination. Parametersfor logical channel prioritization are not configured. The Accessstratum (AS) is provided with the PPPP of a protocol data unittransmitted over PC5 interface by higher layer. There is a PPPPassociated with each logical channel.

A UE does not establish and maintain a logical connection to receivingUEs prior to one-to-many a sidelink communication. Higher layerestablishes and maintains a logical connection for one-to-one sidelinkcommunication including ProSe UE-to-Network Relay operation.

The Access Stratum protocol stack for SBCCH (Sidelink Broadcast ControlChannel) in the PC5 interface consists of RRC, RLC, MAC and PHY as shownbelow in FIG. 7B.

The control plane for establishing, maintaining and releasing thelogical connection for one-to-one sidelink communication is shown inFIG. 7C.

FIG. 8 is a diagram for various transmission modes for Sidelink. Asshown in FIG. 8, the 3GPP sidelink communication supports a total offour transmission modes (TM). Here, TM1 is a base station schedulingmode in D2D/eD2D, and TM2 is a terminal autonomous scheduling mode inD2D/eD2D. Meanwhile, TM 3 is a base station scheduling mode in V2X, andTM 4 is a terminal autonomous scheduling mode in V2X.

Scheduled resource allocation (TM1, 3) is characterized by: i) the UEneeds to be RRC_CONNECTED in order to transmit data; ii) the UE requeststransmission resources from the eNB. The eNB schedules transmissionresources for transmission of sidelink control information and data.

In this case, the UE sends a scheduling request (D-SR or Random Access)to the eNB followed by a Sidelink BSR. Based on the Sidelink BSR the eNBcan determine that the UE has data for a sidelink communicationtransmission and estimate the resources needed for transmission. eNB canschedule transmission resources for sidelink communication usingconfigured SL-RNTI.

The UE autonomous resource selection (TM2, 4) is characterized by:

i) A UE on its own selects resources from resource pools and performstransport format selection to transmit sidelink control information anddata;

ii) There can be up to 8 transmission pools either pre-configured forout of coverage operation or provided by RRC signalling for in-coverageoperation. Each pool can have one or more PPPP associated with it. Fortransmission of a MAC PDU, the UE selects a transmission pool in whichone of the associated PPPP is equal to the PPPP of a logical channelwith highest PPPP among the logical channel identified in the MAC PDU.It is up to UE implementation how the UE selects amongst multiple poolswith same associated PPPP. There is a one to one association betweensidelink control pool and sidelink data pool;

iii) Once the resource pool is selected, the selection is valid for theentire Sidelink Control period. After the Sidelink Control period isfinished the UE may perform resource pool selection again.

FIG. 9 is a conceptual diagram for Vehicle-to-Everything (V2X)communication.

Referring to FIG. 13, the vehicular communication, referred to asVehicle-to-Everything (V2X), can be divided into three different typesincluding Vehicle-to-Vehicle (V2V) Communications,Vehicle-to-Infrastructure (V2I) Communications and Vehicle-to-Pedestrian(V2P) Communications.

These three types of V2X can use “co-operative awareness” to providemore intelligent services for end-users. This means that transportentities, such as vehicles, roadside infrastructure, and pedestrians,can collect knowledge of their local environment (e.g., informationreceived from other vehicles or sensor equipment in proximity) toprocess and share that knowledge in order to provide more intelligentservices, such as cooperative collision warning or autonomous driving.

V2X services can be provided by PC5 interface and/or Uu interface.Support of V2X services via PC5 interface is provided by V2X sidelinkcommunication, which is a mode of communication whereby UEs cancommunicate with each other directly over the PC5 interface. Thiscommunication mode is supported when the UE is served by E-UTRAN andwhen the UE is outside of E-UTRA coverage. Only the UEs authorised to beused for V2X services can perform V2X sidelink communication.

The pace of LTE network deployment is accelerating all over the world,which enables more and more advanced services and Internet applicationsmaking use of the inherent benefits of LTE, such as higher data rate,lower latency and enhanced coverage. Widely deployed LTE-based networkprovides the opportunity for the vehicle industry to realize the conceptof ‘connected cars’. By providing a vehicle with an access to the LTEnetwork a vehicle can be connected to the Internet and other vehicles sothat a broad range of existing or new services can be envisaged. Vehiclemanufacturers and cellular network operators show strong interests invehicle wireless communications for proximity safety services as well ascommercial applications.

In order to respond to this situation, RAN approved the feasibilitystudy on LTE-based V2X services to evaluate new functionalities neededto operate LTE-based V2X (V2V, V2I/N, and V2P), and to investigatepotential enhancements for vehicular services.

FIG. 10A is a diagram for V2V operation scenario, FIG. 10B is a diagramfor V2I operation scenario, and FIG. 10C is a diagram for V2P operationscenario.

V2X communication refers to a communication system that exchangesinformation such as traffic conditions while communicating with roadinfrastructure and other vehicles while driving a vehicle.

V2X includes a vehicle-to-pedestrian (V2P), which means communicationbetween vehicles, a Vehicle to Pedestrian (V2P), which meanscommunication between terminals carried by a vehicle and an individual,a Vehicle-to-Infrastructure/Network (V2I/N), which means communicationbetween the vehicle and the roadside unit (RSU) such as transportationinfrastructure and the network.

For V2X, the following can be considered: i) a scenario for V2Xoperation based on a PC5 interface which is an interface between UEs(FIG. 10A), ii) a scenario for V2V operation based on a Uu interfacewhich is an interface between a base station (eNodeB) and a UE (FIG.10B), iii) iii) Scenario supporting V2V operation using both PC5interface and Uu interface (FIG. 10C).

When sidelink transmission for V2X and Uu occurs at the sametime/subframe, the UE may prefer to select one transmission in order toreduce interference. In this case, how to prioritize the V2X or Uu isnot determined yet.

As described above, basically, when the PC5 sidelink transmission and Uutransmission overlap, the Uu transmission/reception (highest priority)is prioritized over PC5 sidelink communication transmission/reception.In case Sidelink Discovery Gap is configured, PC5 sidelink discoveryannouncement has highest priority except Uu transmission/reception forRACH.

However, V2X requires a new mechanism for performing V2X transmissionprioritized over Uu transmission, because of the characteristicsdifferent from sidelink (SL) data of general D2D communication. Forinstance, V2X data is usually sensitive to latency so that it should bedelivered to the nearby V2X UE within the latency requirement.Otherwise, it would cause serious problem such as car accident. In thissense, when the V2X transmission via SL is overlapped with uplinktransmission in a subframe, it may be necessary to prioritizetransmission of V2X messages via SL.

Further, if a certain SL data (e.g. V2X) is always prioritized over ULtransmission when there is overlap between V2X sidelink transmission andUL transmission, the uplink performance could be severely deteriorated.In other words, the network is not able to know whether the scheduled ULtransmission is not received due to dropping of UL transmission or otherDL/UL problem. In addition, the network is not able to anticipate howmany UL packets need to be dropped for protecting SL packet. This mightcause an impact on LTE performance, especially on PDCCH link adaptationaccuracy and PDCCH capacity. In other words, if the UE does not respondto an UL scheduling the network might assume that the PDCCH has beenlost and increase the robustness of the PDCCH or that the PUSCH is notbeen received and therefore potentially increase the reliability of theUL retransmissions. In addition, with the denial of scheduled ULtransmission, it would result in PDCCH/PUSCH resources. As aconsequence, the prioritized V2X transmission requires a new mechanismfor denial Uu transmissions as much as preconfigured times during avalidity period.

FIG. 11 is a conceptual diagram for performing sidelink transmissionprioritized over uplink transmission in wireless communication systemaccording to embodiments of the present invention.

In this invention, it is proposed of a method of UE applying autonomousdenial of uplink transmission when SL transmission is prioritized overuplink transmission, if they overlap in time. The invention comprises ofdetermining that uplink transmission is denial in the subframe if acriteria is met; and transmitting the sidelink data in the subframewhere autonomous denial of uplink transmission is performed.

When link1 data and link2 data to be transmitted in a same subframe aregenerated by a UE, the UE determines whether link1 transmission isdenied/dropped in a subframe (S1101).

Preferably, the link1 and link2 can be either uplink or sidelink.

The UE considers that link2 transmission is prioritized over the link1transmission if a criteria is met (S1103) and the UE determines thatlink1 transmission is denied in the subframe (S1105).

Preferably, criteria information is provided by a network, and criteriainformation includes priority information, service/applicationinformation, sidelink SPS index or sidelink logical channel identity.

Preferably, the criteria information is transmitted by RRC signaling.

Preferably, the priority indicates ProSe Per Packet Priority (PPPP) orlogical channel priority. Using other priority information for the aboveinvention is not excluded.

When the network provides threshold priority information as criteriainformation, the UE is allowed to perform denial of link1 transmission,if the UE has link2 data of a priority which is equal to or above thethreshold priority information.

Preferably, a higher value of priority indicates a higher priority, or alower value of priority indicates a higher priority.

For example, in case that a lower value of priority indicates a higherpriority, if there are MAC PDUs to be transmitted in this TTI in uplinkand in sidelink and a value of the highest priority of the sidelinklogical channel(s) in the MAC PDU is lower than a threshold priority,the UE determine that sidelink transmission is prioritized over uplinktransmission and sidelink process of the UE transmits sidelink data.

When the network provides list of allowed priority information ascriteria information, the UE is allowed to perform denial of link1transmission, if the UE has link2 data of a priority which belongs tothe given priority information. For data of a priority which does notbelong to the given priority information, the UE is not allowed toperform denial of link1 transmission.

When the network provides service/application information as criteriainformation, service/application information includes sidelinkdiscovery, sidelink communication, wearable sidelink communication orV2X communication, and so on. Preferably, the service/application isidentified by e.g. Provider Service Identifier (PSID).

If service information is provided with the above information, the UE isallowed to perform denial of link1 transmission only when there arelink1 data transmission and link2 data transmission of the indicatedservice at the same time. For instance, if ‘V2X’ is indicated, the UE isallowed to perform denial of link1 transmission when there are link1data transmission and link2 data transmission for V2X at the same time.For other data over link2, the UE does not perform denial of link1transmission.

If service information is not provided, the UE is allowed to performdenial of link1 for any link2 operation regardless ofapplications/services. Alternatively, if service information is notprovided, the UE is allowed to perform denial of link1 for predefinedlink2 operation/application/service.

When the network provides sidelink SPS index or sidelink logical channelidentity as criteria information, the UE is allowed to perform denial oflink1 only when there are link1 data transmission and link2 datatransmission of the indicated sidelink SPSs or sidelink logical channelsat the same time. When the UE determines that link1 transmission isdenied in the subframe, the UE performs autonomous denial procedure forlink1 transmission and transmits link2 data in the subframe (S1107).

The autonomous denial procedure in a subframe for link1 transmissionincludes:

counting the number of the denial subframes of the link1 transmissionduring the validity period including previous subframes and thesubframe, and determining that the link 1 transmission is denied untilthe number of the denial subframes reaches a configured maximum number.

Preferably, Autonomous denial information for performing autonomousdenial procedure is configured by the network via dedicated and/orbroadcast signalling.

Preferably, Autonomous denial information is provided with criteriainformation by a network.

Preferably, Autonomous denial information for performing autonomousdenial procedure is transmitted by RRC signaling.

Preferably, Autonomous denial information includesautonomousDenialSubframes, and autonomousDenialValidity.

The “autonomousDenialSubframes” indicates that the maximum number of thelink1 subframes for which the UE is allowed to deny any link1transmission. Value n2 corresponds to 2 subframes, n5 to 5 subframes andso on.

The “autonomousDenialValidity” indicates the validity period over whichthe link1 autonomous denial subframes shall be counted. Value sf200corresponds to 200 subframes, sf500 corresponds to 500 subframes and soon.

When the UE performs autonomous denial procedure for link1 transmission,the UE counts the number of denials of subframes for link1 transmissionover a validity period including previous subframes and a currentsubframe indicated by autonomousDenialValidity, and denying scheduledlink1 transmission at the current subframe if the number of denials ofsubframes for link1 transmission is less than a threshold indicated byutonomousDenialSubframes.

Preferably, the autonomous denial procedure includes 3 types of denial.

In case of per-UE based denial, the UE denies scheduled link1transmission which occurs at the same time/subframe of any link2transmission and sums up all the denials and compares with threshold. Inthis case, the network doesn't provide other criteria information or,network signals that link1 denial is counted and compared with denialthreshold per UE.

In case of per-resource reservation process based denial, the networksignals that link1 denial is counted and compared with denial thresholdper resource reservation process. If this is signalled, the UE countsthe number of autonomous denials of link1 transmission for each resourcereservation process separately and compares the counted number with theautonomousDenialSubframes for each resource reservation process. Inother words, if the link1 transmission is denied due to link2transmission of resource reservation process 1, the UE adds to thenumber of denials for resource reservation process 1. If the link1transmission is denied due to simultaneous link2 transmissions ofresource reservation process 1 and resource reservation process 2, theUE adds to the each number of denials for resource reservation process 1and resource reservation process 2.

In case of per-priority/logical channel/SPS/service based denial, ifassociated priorities/logical channels/SPS index/service information isprovided with autonomous denial information, the UE only counts thenumber of autonomous denials of link1 transmission for protection oflink2 transmission of associated priorities/logicalchannels/SPSs/services separately and compares the counted number withthe associated autonomousDenialSubframes. If multiple sets of autonomousdenial information and associated criteria information are provided, theUE counts the number of link1 autonomous denials performed forassociated priorities/logical channels/SPSs/services of each setseparately and compares the counted number with the associatedautonomousDenialSubframes of the set. If the link1 transmission isdenied due to simultaneous link2 transmissions associated with multiplepriorities/logical channels/SPSs/service of the multiple set, the UEincreases the number of denials for each set.

Alternatively, if the link1 transmission is denied due to link2transmission of one PDU associated with multiple priorities of themultiple set, the UE increases the number of denials for the set ofhighest priorities.

One or more set of autonomous denial information per one or morecriteria can be provided. For instance, One set of autonomous denialinformation consists of the above autonomous denial information andassociated priority information. The example of multiple set is shownbelow Table 1:

TABLE 1 Set 1: AutonomousDenialSubframe: n30, AutonomousDenialValidity:sf500, Priority: Prio7, prio8 Set 2: AutonomousDenialSubframe: n15,AutonomousDenialValidity: sf500, Priority: Prio4, prio5, prio6 Set 3:AutonomousDenialSubframe: n5, AutonomousDenialValidity: sf500, Priority:Prio1, prio2, prio3, prio4

In the above example, for transmission of link2 data having priority 7or priority 8, the UE applies the n30 as autonomousDenialSubframe andsf500 as autonomousDenialValidity. For transmission of link2 data havingpriority 4, priority 5 or priority 6, the UE applies the n15 asautonomousDenialSubframe and sf500 as autonomousDenialValidity.

Another example of signalling regarding service is shown below Table 2.

TABLE 2 Set 1: AutonomousDenialSubframe: n30, AutonomousDenialValidity:sf500, Service: V2X communication Set 2: AutonomousDenialSubframe: n15,AutonomousDenialValidity: sf500, Service: Sidelink communication Set 3:AutonomousDenialSubframe: n5, AutonomousDenialValidity: sf500, Priority:Sidelink discovery

In the above example, different denial information is applied for eachlink2 service. For example, for V2X communication, the UE applies then30 as autonomousDenialSubframe and sf500 as autonomousDenialValidity.

Meanwhile, when link2 transmission is not prioritized over the link1transmission, the UE shall not deny any transmission in a particularsubframe (i.e. prioritizes link1 transmission) even if during the numberof subframes indicated by validity period (e.g.autonomousDenialValidity), preceding and including this particularsubframe, it autonomously denied fewer UL subframes than indicated bythreshold subframes (autonomousDenialSubframes).

For instance, if the random access procedure is initiated, the UE isrequired to transmit Msg.3 and transmission of Msg.3 collides with thetransmission of sidelink packet which has higher PPPP value than theconfigured PPPP threshold, Msg.3 MAC PDU might need to be transmitted tocomplete the random access procedure.

In case that UE shall not deny any link 1 transmission in a particularsubframe (that is, in case that link 1 data is prioritized over the link2 data), the link 1 data is a MAC PDU obtained from the Msg3 buffer(i.e. a Random Access Response containing a Random Access Preambleidentifier corresponding to the transmitted Random Access Preamble bythe UE and the UE is scheduled to transmit Msg.3), or a MAC PDU which isscheduled to be transmitted contains the MAC SDU corresponding toSRB0(CCCH)/SRB1/SRB2, or a data of which logical channel priority of ULMAC PDU is higher than a (pre)configured threshold priority, or a dataof which Logical channel identities which is prioritized over any link 2transmission is provided to the UE and the MAC PDU includes the SDUs ofthe logical channels indicated as being prioritized, or a MAC PDU whichis scheduled to be transmitted contains the MAC CE for BSR or PHR, andso on.

Preferably, if logical channel priority of link 1 MAC PDU is higher thana (pre)configured threshold priority, for this, the network providesthreshold logical channel priority or logical channel identity viabroadcast/dedicated signalling.

Preferably, the link 1 data belonging to logical channels which hashigher priority than the indicated threshold or than the priority of theindicated logical channel, and the logical channel priority of link 1MAC PDU is the highest priority of priorities of MAC SDUs included inthe link 1 MAC PDU.

When the UE determines that link 1 transmission is not denied in thesubframe because the link 1 transmission is prioritized over link 2transmission, the UE transmits the link 1 data in the subframe (S1111),and the UE also selects the resources for link2 transmission exceptresources overlapped with link 1 transmission so that the UE transmitslink 2 data using grant corresponding to transmission of a single MACPDU (S1113).

When the UE transmits the link2 data using grant corresponding totransmission of a single MAC PDU, the MAC entity for may select thenumber of HARQ retransmissions from the allowed numbers configured byupper layers in allowedRetxNumberPSSCH, and an amount of frequencyresources within the range configured by upper layers betweenminRB-NumberPSSCH and maxRB-NumberPSSCH.

If transmission based on random selection is configured by upper layers,the MAC entity randomly selects time and frequency resources for onetransmission opportunity of SCI and SL-SCH from a resource pool. Therandom function shall be such that each of the allowed selections can bechosen with equal probability, And if else, the UE randomly selects thetime and frequency resources for one transmission opportunity of SCI andSL-SCH from the resource pool, excluding the resources indicated by thephysical layer. The random function shall be such that each of theallowed selections can be chosen with equal probability.

Preferably, the UE is RRC CONNECTED, RRC IDLE or RRC INACTIVE.

Preferably, the UE is performing UE autonomous resource selection usingdedicated sidelink resource pools for transmission of sidelinkcommunication.

Preferably, ‘denial’ can be used interchangeably with ‘dropping’.

Preferably, in case UL frequency and SL frequency are different, insteadof dropping/denial, the power allocation to the prioritized transmissionbetween UL and SL can be performed. In other words, the UE firstlyallocates the UE power to prioritized transmission and the UE allocatesthe remaining power to the de-prioritized transmission.

FIG. 12 is an example for performing sidelink transmission prioritizedover uplink transmission in wireless communication system according toembodiments of the present invention.

It is assumed that UL data transmission and sidelink transmission ofdata of PPPP2, PPPP5 and PPPP7 is expected to occur at the sametime/subframe.

The network configures denial rate and associated priority information(S1201). The denial rate information consists ofautonomousDenialSubframe and autonomousDenialValidity.

When the sidelink data of PPPP7 and Uu data needs to be transmitted inthe same subframe, the UE determines whether autonomous denial for dataof PPPP7 is allowed (S1203).

If autonomous denial for data of PPPP7 is allowed, the UE additionallydetermines whether autonomous denial rate is below the threshold A. Ifautonomous denial for data of PPPP7 is not allowed, the UE deniessidelink transmission (S1205).

If autonomous denial rate is below the threshold A, the UE denies ULtransmission. If autonomous denial rate is not below the threshold A,the UE denies sidelink transmission (S1207).

When the sidelink data of PPPP5 and Uu data needs to be transmitted inthe same subframe, the UE determines whether autonomous denial for dataof PPPP5 is allowed (S1209).

If autonomous denial for data of PPPP5 is allowed, the UE additionallydetermines whether autonomous denial rate is below the threshold B. Ifautonomous denial for data of PPPP5 is not allowed, the UE deniessidelink transmission (S1211).

If autonomous denial rate is below the threshold B, the UE denies ULtransmission. If autonomous denial rate is not below the threshold B,the UE denies sidelink transmission (S1213).

If autonomous denial for data of PPPP2 is allowed, the UE determineswhether autonomous denial for data of PPPP2 is allowed (S1215). Ifautonomous denial rate is not allowed, the UE denies sidelinktransmission (S1217).

The embodiments of the present invention described hereinbelow arecombinations of elements and features of the present invention. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent invention may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent invention may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It is obvious tothose skilled in the art that claims that are not explicitly cited ineach other in the appended claims may be presented in combination as anembodiment of the present invention or included as a new claim bysubsequent amendment after the application is filed.

In the embodiments of the present invention, a specific operationdescribed as performed by the BS may be performed by an upper node ofthe BS. Namely, it is apparent that, in a network comprised of aplurality of network nodes including a BS, various operations performedfor communication with an MS may be performed by the BS, or networknodes other than the BS. The term ‘eNB’ may be replaced with the term‘fixed station’, ‘Node B’, ‘Base Station (BS)’, ‘access point’, etc.

The above-described embodiments may be implemented by various means, forexample, by hardware, firmware, software, or a combination thereof.

In a hardware configuration, the method according to the embodiments ofthe present invention may be implemented by one or more ApplicationSpecific Integrated Circuits (ASICs), Digital Signal Processors (DSPs),Digital Signal Processing Devices (DSPDs), Programmable Logic Devices(PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers,microcontrollers, or microprocessors.

In a firmware or software configuration, the method according to theembodiments of the present invention may be implemented in the form ofmodules, procedures, functions, etc. performing the above-describedfunctions or operations. Software code may be stored in a memory unitand executed by a processor. The memory unit may be located at theinterior or exterior of the processor and may transmit and receive datato and from the processor via various known means.

Those skilled in the art will appreciate that the present invention maybe carried out in other specific ways than those set forth hereinwithout departing from essential characteristics of the presentinvention. The above embodiments are therefore to be construed in allaspects as illustrative and not restrictive. The scope of the inventionshould be determined by the appended claims, not by the abovedescription, and all changes coming within the meaning of the appendedclaims are intended to be embraced therein.

INDUSTRIAL APPLICABILITY

While the above-described method has been described centering on anexample applied to the 3GPP LTE system, the present invention isapplicable to a variety of wireless communication systems in addition tothe 3GPP LTE system.

The invention claimed is:
 1. A method performed by a user equipment (UE)operating in a wireless communication system, the method comprising:generating uplink data and sidelink data to be transmitted in atransmission time; determining that a transmission of the uplink data isdenied in the transmission time based on a transmission of the sidelinkdata being prioritized over a transmission of the uplink data; andtransmitting the sidelink data in the transmission time where thetransmission of the uplink data is denied, wherein the transmission ofthe sidelink data is prioritized over the transmission of the uplinkdata based on a highest priority of one or more logical channels in aMAC PDU corresponding to the sidelink data being higher than a firstthreshold priority.
 2. The method according to claim 1, wherein the UEdrops the transmission of the uplink data in the transmission time basedon the transmission of the sidelink data being prioritized over thetransmission of the uplink data in the transmission time.
 3. The methodaccording to claim 2, wherein the transmission of the uplink data isprioritized over the transmission of the sidelink data based on: theuplink data being obtained from a Msg3 buffer of a random access channel(RACH) procedure; or the uplink data being transmitted to serving radiobearer (SRB)0, or SRB1, or SRB2; or the uplink data including MACcontrol element (CE) for buffer status reporting (BSR) or power headroomreporting (PHR).
 4. The method according to claim 1, further comprising:determining that the transmission of the uplink data is not denied inthe transmission time based on the transmission of the uplink data beingprioritized over the transmission of the sidelink data, and transmittingthe uplink data in the transmission time.
 5. The method according toclaim 4, wherein the transmission of the uplink data is prioritized overthe transmission of the sidelink data based on a highest priority of oneor more logical channels in a MAC PDU corresponding to the uplink databeing higher than a second threshold priority.
 6. The method accordingto claim 4, further comprising: transmitting the sidelink data using asidelink grant corresponding to transmission of a single MAC PDU in atransmission time different from the transmission time where the uplinkdata is transmitted.
 7. The method according to claim 1, wherein thesidelink data is for Vehicle-to-Everything (V2X) services.
 8. A methodperformed by a user equipment (UE) operating in a wireless communicationsystem, the method comprising: generating uplink data to be transmittedon an uplink in a transmission time; determining an existence ofsidelink data to be transmitted on a sidelink in the transmission time;determining that a transmission of the sidelink data is denied in thetransmission time based on the sidelink data to be transmitted in thetransmission time existing and a priority corresponding to a firstMedium Access Control Packet Data Unit (MAC PDU) of the uplink databeing higher than a first threshold priority; and transmitting the firstMAC PDU in the transmission time based on the transmission of thesidelink data being denied, wherein the priority corresponding to thefirst MAC PDU of the uplink data is a highest priority of one or morelogical channels in the first MAC PDU.
 9. The method according to claim8, wherein the UE drops the transmission of the sidelink data in thetransmission time based on the transmission of the uplink data beingprioritized over the transmission of the sidelink data in thetransmission time.
 10. The method according to claim 8, furthercomprising: generating a second MAC PDU to be transmitted on thesidelink in the transmission time; receiving a sidelink grant for thesecond MAC PDU; and determining that a transmission of the sidelink datais not denied in the transmission time based a highest priority of oneor more logical channels in the second MAC PDU being higher than asecond threshold priority.
 11. The method according to claim 8, whereinthe sidelink data is for Vehicle-to-Everything (V2X) services.
 12. AUser Equipment (UE) configured to operate for operating in a wirelesscommunication system, the UE comprising: a Radio Frequency (RF) module;and a processor operably coupled with the RF module and configured to:generate uplink data and sidelink data to be transmitted in atransmission time, determine that a transmission of the uplink datadenied in the transmission time based on a transmission of the sidelinkdata being prioritized over the transmission of the uplink data, andtransmit the sidelink data in the transmission time where thetransmission of the uplink data is denied, wherein the transmission ofthe sidelink data is prioritized over the transmission of the uplinkdata based on a highest priority of one or more logical channels in aMAC PDU corresponding to the sidelink data being higher than a firstthreshold priority.
 13. The UE according to claim 12, wherein thetransmission of the uplink data is dropped by the UE in the transmissiontime based on the transmission of the sidelink data being prioritizedover the transmission of the uplink data in the transmission time. 14.The UE according to claim 12, wherein the processor is furtherconfigured to: determine that the transmission of the uplink data is notdenied in the transmission time based on the transmission of the uplinkdata being prioritized over the transmission of the sidelink data; andtransmit the uplink data in the transmission time.
 15. The UE accordingto claim 14, wherein the transmission of the uplink data is prioritizedover the transmission of the sidelink data based on a highest priorityof one or more logical channels in a MAC PDU corresponding to the uplinkdata being higher than a second threshold priority.
 16. The UE accordingto claim 14, wherein the processor is further configured to transmit thesidelink data using a sidelink grant corresponding to transmission of asingle MAC PDU in a transmission time different from the transmissiontime where the uplink data is transmitted.